Nec B58944 Datasheet Direct

The B58944 is specifically engineered for:

Search for "NEC marking code B58944" on a SMD code website (e.g., smd.yooneed.one or markingcodes.com).
But since that specific 5-digit number is unusual, try this instead:

Once you have the true part number (e.g., NEC 2SC945, NEC PS2561, NEC uPD78F0537), use this method:

NEC B58944 is an integrated circuit, specifically identified as a 256 K-bit Static Random Access Memory (SRAM) chip. It is often cross-referenced or equivalent to the $\mu$PD43256BGU-70L Technical Specifications

Based on its classification and industry cross-references, the following specifications apply: Device Type : CMOS Static RAM (SRAM) Memory Density : 256 Kib (32K x 8 bits) Package Type : SO-28 (Small Outline Package, 28-pin) Common Applications

: Frequently utilized in automotive Electronic Control Units (ECUs), such as those found in Volvo XC70 and XC90 models, where it functions as a driver or memory component. Operational Context Equivalent Model : The device is functionally identical to the NEC $\mu$PD43256B series, which is a high-speed, low-power CMOS SRAM.

: It is designed for applications requiring high reliability and low power consumption, typical of industrial and automotive embedded systems.

For procurement or replacement, these parts are often stocked by specialized electronic component distributors such as Jotrin Electronics Jotrin Electronics full PDF datasheet for the $\mu$PD43256B equivalent, or do you need a pinout diagram NEC B58944 ECU DRIVER SOP-28 - Inovauto.com

* VOLVO XC70 2.4 D 185CV EDC16C31 0281012103 1037375898 1037400254 Cks_7D2A. * VOLVO XC90 2.4D 163CV EDC15C11 3067014741 Cks_B157. Inovauto.com B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics nec b58944 datasheet

The story of the NEC B58944 is a classic case of a "ghost" component—a part that is vital to keeping millions of vehicles on the road but officially exists only in the shadow of proprietary documentation. The Role: The Unsung Hero of the EDC16 The NEC B58944 (often labeled with D43256BGU-70Y

) is a specialized automotive memory and driver chip found deep within the Bosch EDC16

engine control units (ECUs). These ECUs are the "brains" of diesel engines in popular vehicles like the Volvo XC70

. While most consumer chips have public datasheets, the B58944 is a "vulnerable" part—meaning it is one of the first things to fail when a car's computer board encounters a power surge or thermal stress. The Legend: The Missing Datasheet

The real "story" for engineers and mechanics is the hunt for the datasheet. Because this chip was custom-manufactured by NEC for Bosch, a standard public datasheet doesn't technically exist in the way it does for a generic transistor. www.bosch-semiconductors.com The Repair Community: For years, ECU repair specialists on forums and sites like

have traded "verified" pinout diagrams and replacement tips like secret maps to buried treasure. The Specialty Market:

Because you can't just buy these at a local hobby shop, they are sourced through niche distributors like Jotrin Electronics Auto-Chips Why It Matters to You

If you are looking for the "NEC B58944 datasheet," you are likely trying to save a car from the scrap heap. In the world of automotive electronics, this chip represents the thin line between a $20 repair $2,000 ECU replacement

. It is the quiet workhorse that manages the fuel injection and timing that keeps a diesel engine humming. NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

Troubleshooting and Repairing Auto ECUs: The NEC B58944 IC If you're in the world of automotive electronics repair, you've likely encountered the NEC B58944 . Often found in BOSCH automotive engine ECU

(Engine Control Unit) boards, this specialized integrated circuit (IC) is a critical component for engine management systems. The B58944 is specifically engineered for: Search for

Because these chips are frequently targeted for repairs when an ECU fails, finding the right technical data is essential for a successful fix. Technical Specifications

The NEC B58944 is an integrated circuit typically housed in a (Small Outline Package with 28 pins). Jotrin Electronics Manufacturer: NEC Corporation (now part of Renesas Electronics). Package Type: Common Part Variants: Often labeled as NEC B58944 D43256BGU-70Y Compliance: Generally available as Lead-free/RoHS compliant. Jotrin Electronics Primary Applications This IC is most commonly used as an automotive engine drive chip

. It is a "workhorse" component within BOSCH ECU architectures. Technicians often look for this specific datasheet when troubleshooting: Engine Computer Failures:

Stalling, non-starting, or intermittent sensor errors can sometimes be traced back to a damaged B58944 chip. ECU Board Repair:

Instead of replacing an entire expensive ECU, many specialized shops replace this specific IC to restore functionality. Important Repair Note

If you are purchasing a replacement chip, be aware that many listings for the NEC B58944 describe it as an empty chip

. This means it may not contain the specific program or data required for your vehicle's specific engine mapping. Depending on the exact sub-function of the chip in your ECU (such as if it acts as a memory or programmable driver), you may need to program it or "clone" the data from the original chip if it is still readable. Where to Find the Datasheet

Finding the original manufacturer datasheet can be tricky for automotive-grade ICs as they are often proprietary. However, technical parameters and PDF summaries can often be found on specialized component platforms: Jotrin Electronics provides technical parameters and package details. ALLDATASHEET

is a standard go-to for PDF lookups, though automotive chips may sometimes only show basic pinout configurations. B58944 Datasheet, PDF - Alldatasheet. ALLDATASHEET.COM B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics

While the NEC B58944 could refer to a variety of internal manufacturing codes, in the world of automotive electronics and semiconductor repair, it is most widely recognized as a specialized integrated circuit (IC) used in Bosch Engine Control Units (ECUs).

The following essay explores the technical identity, applications, and specifications of this component based on available engineering data. The Role of the NEC B58944 in Automotive Systems Common NEC equivalents (by package):

The NEC B58944 is a high-density semiconductor component, frequently identified by its equivalent part number, μPD43256BGU-70L. In technical terms, it is a Static Random Access Memory (SRAM) chip organized with a capacity of 256 Kilobits (32K x 8 bits).

In modern automotive engineering, this IC serves as a critical "worker" memory for the ECU. While the main processor handles complex calculations for fuel injection, ignition timing, and emission controls, it requires high-speed, reliable SRAM like the B58944 to store temporary data and look-up tables that change rapidly during engine operation. Key Technical Specifications

Based on the datasheet for the μPD43256BGU-70L equivalent, the B58944 typically features the following characteristics:

Package Type: SOP-28 (Small Outline Package) or SO-28, a surface-mount design with 28 pins. Memory Density: 256 Kib (32,768 words × 8 bits).

Access Speed: The "-70" suffix typically denotes an access time of 70 nanoseconds, meeting the high-speed requirements of automotive real-time processing.

Architecture: Parallel SRAM, allowing for direct and fast data retrieval by the host microcontroller. Applications and Repair

The B58944 is primarily found in Bosch automotive controllers used by various manufacturers, including Honda, Iveco, and others using the ME7 and EDC16 series computer boards.

Because these chips are subjected to extreme thermal cycles and electrical noise within the engine bay, they are known to be "easily damaged parts". In the repair community, the B58944 is often sought as a replacement component to fix "dead" or malfunctioning ECU boards that have lost the ability to process sensor data correctly. Notably, when purchased as a spare part, it is typically provided as an "empty" chip, as the specific operating data is loaded by the ECU's central processor during boot-up or operation. Conclusion

The NEC B58944 is more than just a part number; it is a vital link in the chain of automotive reliability. As a 256K SRAM chip housed in a compact SOP-28 package, it provides the low-latency memory environment necessary for modern engines to run efficiently. For engineers and technicians, identifying its relationship to the μPD43256BGU series is the key to sourcing the correct datasheet and ensuring successful hardware diagnostics. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com NEC B58944 ECU DRIVER SOP-28. Inovauto.com NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

While specific pin pitch varies by board revision, the interface logic remains standard.

Primary Interfaces:

Design Tip: Always use 3.3V logic levels. Do not connect directly to 5V MCUs without a logic level shifter, as this will damage the module.

If the B58944 is defective and no datasheet exists, consider these strategies: